public NightshiftTicker(ImageDatabase newImageDatabase, SunriseSunset newSunriseSunset)
{
imageDatabase = newImageDatabase;
sunriseSunset = newSunriseSunset;
lastId = -1;
}
static double GetNightIndex(LocalTime time, SunriseSunset sunriseSunset)
{
var transitionInterval = 1.0;
var timeHours = TimeToHours(time);
var sunriseHours = TimeToHours(sunriseSunset.Sunrise);
var sunsetHours = TimeToHours(sunriseSunset.Sunset);
var sunriseDelta = sunriseHours - timeHours;
var sunsetDelta = timeHours - sunsetHours;
var minAbsDelta = Min(Abs(sunriseDelta), Abs(sunsetDelta));
if (sunriseHours < sunsetHours)
{
if (sunriseDelta >= 0 || sunsetDelta >= 0)
{
var minDelta = minAbsDelta;
if (minDelta >= transitionInterval / 2)
{
return(1);
}
return((minDelta + transitionInterval / 2) / transitionInterval);
}
else
{
var maxDelta = -minAbsDelta;
if (maxDelta <= -transitionInterval / 2)
{
return(0);
}
return((transitionInterval / 2 + maxDelta) / transitionInterval);
}
}
else
{
if (sunriseDelta >= 0 && sunsetDelta >= 0)
{
var minDelta = minAbsDelta;
if (minDelta >= transitionInterval / 2)
{
return(1);
}
return((minDelta + transitionInterval / 2) / transitionInterval);
}
else
{
var maxDelta = -minAbsDelta;
if (maxDelta <= -transitionInterval / 2)
{
return(0);
}
return((transitionInterval / 2 + maxDelta) / transitionInterval);
}
}
}
